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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99831] ICE: in reshape_init, at cp/decl.c:6720
Date: Wed, 31 Mar 2021 01:04:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99831

--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The problem is that post-r277865 in defaulted_late_check we call
synthesize_method here:

  if (kind =3D=3D sfk_comparison)
    {=20=20=20=20
      /* If the function was declared constexpr, check that the definition
         qualifies.  Otherwise we can define the function lazily.  */
      if (DECL_DECLARED_CONSTEXPR_P (fn) && !DECL_INITIAL (fn))
        synthesize_method (fn);
      return;
    }

and that results in garbage collection, which then frees {} that we created
when parsing the braced-list in string<"a">{}.  Then of course accessing the
freed data fails.=